Frequency multiplexing for sidelink transmissions

Abstract

Methods, systems, and devices for wireless communications are described to reduce interference caused by power leakage. A first user equipment (UE) or a base station may select communication resources for a sidelink communication based on a distance between UEs reserving frequency resources in a same time window. The first UE or the base station may determine a distance parameter between the first UE and one or more other UEs (e.g., including a second UE) reserving frequency resources within the time window. The distance parameter may represent a physical distance between the first and second UEs or a reference signal received power of the second UE as received by the first UE. The first UE or the base station may select communication resources based on whether the distance parameter is below a threshold, and the first UE may communicate the sidelink communication using the selected resources.

What is claimed is: 
     
         1 . A method for wireless communications at a first user equipment (UE), comprising:
 identifying a distance parameter associated with the first UE and a second UE;   determining whether the distance parameter is less than a threshold;   performing, within a time window that includes a communication resource allocated to the second UE and based at least in part on determining whether the distance parameter is less than the threshold, a selection process for a frequency resource for a frequency multiplexed sidelink communication; and   transmitting the frequency multiplexed sidelink communication based at least in part on the selection process.   
     
     
         2 . The method of  claim 1 , further comprising:
 determining that the distance parameter is less than the threshold; and   selecting the frequency resource for the frequency multiplexed sidelink communication within the time window based at least in part on the distance parameter being less than the threshold.   
     
     
         3 . The method of  claim 1 , further comprising:
 determining that the distance parameter is greater than the threshold;   identifying a restriction for the frequency resource for the frequency multiplexed sidelink communication based at least in part on the distance parameter being greater than the threshold; and   selecting the frequency resource for the frequency multiplexed sidelink communication based at least in part on the restriction.   
     
     
         4 . The method of  claim 3 , wherein selecting the frequency resource comprises:
 excluding, based at least in part on the restriction, frequency resources within the time window from candidate resources for selecting the frequency resource.   
     
     
         5 . The method of  claim 3 , wherein selecting the frequency resource comprises:
 selecting, based at least in part on the restriction, the frequency resource for the frequency multiplexed sidelink communication within the time window and offset in frequency from the communication resource allocated to the second UE.   
     
     
         6 . The method of  claim 1 , wherein identifying the distance parameter comprises:
 determining the distance parameter based at least in part on measuring a reference signal received power from the second UE, wherein the distance parameter and the threshold comprise respective reference signal received powers.   
     
     
         7 . The method of  claim 6 , wherein:
 a plurality of UEs comprising the second UE are allocated respective communication resources within the time window; and   the second UE has a smallest reference signal received power relative to the first UE out of the plurality of UEs.   
     
     
         8 . The method of  claim 1 , wherein identifying the distance parameter comprises:
 determining the distance parameter based at least in part on a location of the first UE and an indication of a location of the second UE, wherein the distance parameter and the threshold comprise respective distances.   
     
     
         9 . The method of  claim 8 , wherein:
 a plurality of UEs comprising the second UE are allocated respective communication resources within the time window; and   the second UE has a largest distance from the first UE out of the plurality of UEs.   
     
     
         10 . The method of  claim 1 , wherein:
 a plurality of UEs comprising the second UE are allocated respective communication resources within the time window; and   the second UE initiates a channel occupancy time used by the first UE and the second UE.   
     
     
         11 . The method of  claim 1 , wherein identifying the distance parameter comprises:
 determining the distance parameter based at least in part on a location of the first UE and a location of a channel occupancy time used by the second UE, wherein the distance parameter and the threshold comprise respective distances.   
     
     
         12 . The method of  claim 11 , wherein the location of the channel occupancy time comprises a location of a wireless device that initiates the channel occupancy time. 
     
     
         13 . The method of  claim 11 , wherein determining whether the distance parameter is less than the threshold comprises:
 determining that the distance parameter is less than the threshold based at least in part on a zone identifier associated with the first UE being a same zone identifier associated with the channel occupancy time, wherein the location of the channel occupancy time comprises a geographic location or geographic zone associated with the channel occupancy time.   
     
     
         14 . The method of  claim 11 , wherein the location of the channel occupancy time is received via channel occupancy time sharing information or is configured for the channel occupancy time. 
     
     
         15 . A method for wireless communications at a base station, comprising:
 identifying a distance parameter associated with a first user equipment (UE) and a second UE;   determining whether the distance parameter is less than a threshold;   performing, within a time window that comprises a communication associated with the second UE and based at least in part on determining whether the distance parameter is less than the threshold, a selection process for a frequency resource for a frequency multiplexed sidelink communication for the first UE; and   allocating resources to the first UE for the frequency multiplexed sidelink communication based at least in part on the selection process.   
     
     
         16 . The method of  claim 15 , further comprising:
 determining that the distance parameter is less than the threshold; and   allocating the frequency resource for the frequency multiplexed sidelink communication within the time window based at least in part on the distance parameter being less than the threshold.   
     
     
         17 . The method of  claim 15 , further comprising:
 determining that the distance parameter is greater than the threshold;   identifying a restriction for the frequency resource for the frequency multiplexed sidelink communication based at least in part on the distance parameter being greater than the threshold; and   allocating the frequency resource for the frequency multiplexed sidelink communication based at least in part on the restriction.   
     
     
         18 . The method of  claim 17 , wherein allocating the frequency resource comprises:
 allocating, based at least in part on the restriction, the frequency resource for the frequency multiplexed sidelink communication within a second time window different than the time window.   
     
     
         19 . The method of  claim 17 , wherein allocating the frequency resource comprises:
 allocating, based at least in part on the restriction, the frequency resource for the frequency multiplexed sidelink communication within the time window and offset in frequency from a communication resource allocated to the second UE.   
     
     
         20 . The method of  claim 15 , wherein identifying the distance parameter comprises:
 determining the distance parameter based at least in part on receiving an indication, from the first UE, of a reference signal received power of the second UE, wherein the distance parameter and the threshold comprise respective reference signal received powers.   
     
     
         21 . The method of  claim 15 , wherein identifying the distance parameter comprises:
 determining the distance parameter based at least in part on receiving an indication of a location of the first UE and an indication of a location of the second UE, wherein the distance parameter and the threshold comprise respective distances.   
     
     
         22 . An apparatus for wireless communications at a first user equipment (UE), comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and executable by the processor to cause the apparatus to:
 identify a distance parameter associated with the first UE and a second UE; 
 determine whether the distance parameter is less than a threshold; 
 perform, within a time window that includes a communication resource allocated to the second UE and based at least in part on determining whether the distance parameter is less than the threshold, a selection process for a frequency resource for a frequency multiplexed sidelink communication; and 
 transmit the frequency multiplexed sidelink communication based at least in part on the selection process. 
   
     
     
         23 . The apparatus of  claim 22 , wherein the instructions are further executable by the processor to cause the apparatus to:
 determine that the distance parameter is less than the threshold; and   select the frequency resource for the frequency multiplexed sidelink communication within the time window based at least in part on the distance parameter being less than the threshold.   
     
     
         24 . The apparatus of  claim 22 , wherein the instructions are further executable by the processor to cause the apparatus to:
 determine that the distance parameter is greater than the threshold;   identify a restriction for the frequency resource for the frequency multiplexed sidelink communication based at least in part on the distance parameter being greater than the threshold; and   select the frequency resource for the frequency multiplexed sidelink communication based at least in part on the restriction.   
     
     
         25 . The apparatus of  claim 24 , wherein the instructions to select the frequency resource are executable by the processor to cause the apparatus to:
 exclude, base at least in part on the restriction, frequency resources within the time window from candidate resources for selecting the frequency resource.   
     
     
         26 . The apparatus of  claim 24 , wherein the instructions to select the frequency resource are executable by the processor to cause the apparatus to:
 select, based at least in part on the restriction, the frequency resource for the frequency multiplexed sidelink communication within the time window and offset in frequency from the communication resource allocated to the second UE.   
     
     
         27 . The apparatus of  claim 22 , wherein the instructions to identify the distance parameter are executable by the processor to cause the apparatus to:
 determine the distance parameter based at least in part on measuring a reference signal received power from the second UE, wherein the distance parameter and the threshold comprise respective reference signal received powers.   
     
     
         28 . The apparatus of  claim 22 , wherein the instructions to identify the distance parameter are executable by the processor to cause the apparatus to:
 determine the distance parameter based at least in part on a location of the first UE and an indication of a location of the second UE, wherein the distance parameter and the threshold comprise respective distances.   
     
     
         29 . The apparatus of  claim 22 , wherein the instructions to identify the distance parameter are executable by the processor to cause the apparatus to:
 determine the distance parameter based at least in part on a location of the first UE and a location of a channel occupancy time used by the second UE, wherein the distance parameter and the threshold comprise respective distances.   
     
     
         30 . An apparatus for wireless communications at a base station, comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and executable by the processor to cause the apparatus to:
 identify a distance parameter associated with a first user equipment (UE) and a second UE; 
 determine whether the distance parameter is less than a threshold; 
 perform, within a time window that comprises a communication associated with the second UE and based at least in part on determining whether the distance parameter is less than the threshold, a selection process for a frequency resource for a frequency multiplexed sidelink communication for the first UE; and 
 allocate resources to the first UE for the frequency multiplexed sidelink communication based at least in part on the selection process.